/* fm_demod.h */
/*
This file is part of a program that implements a Software-Defined Radio.

Copyright (C) 2004, 2005, 2006, 2007, 2008 by Frank Brickle, AB2KT and Bob McGwier, N4HY

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

The authors can be reached by email at

ab2kt@arrl.net
or
rwmcgwier@gmail.com

or by paper mail at

The DTTS Microwave Society
6 Kathleen Place
Bridgewater, NJ 08807
*/

#ifndef _fm_demod_h
#define _fm_demod_h

#include <fromsys.h>
#include <banal.h>
#include <splitfields.h>
#include <datatypes.h>
#include <bufvec.h>
#include <cxops.h>
#include <fastrig.h>
#include <update.h>
#include <lmadf.h>
#include <fftw3.h>
#include <ovsv.h>
#include <filter.h>
#include <oscillator.h>

typedef struct _fm_demod {
  int size;
  CXB ibuf, obuf;
  struct {
    REAL alpha, beta;
    struct { REAL f, l, h; } freq;
    REAL phs;
    struct { REAL alpha; } iir;
    COMPLEX delay;
  } pll;

  REAL lock, afc, cvt;
} FMDDesc, *FMD;

extern void FMDemod(FMD fm);
extern FMD newFMD(REAL samprate,
		  REAL f_initial,
		  REAL f_lobound,
		  REAL f_hibound,
		  REAL f_bandwid,
		  int size,
		  COMPLEX *ivec,
		  COMPLEX *ovec,
		  char *tag);
extern void delFMD(FMD fm);

#ifndef TWOPI
#define TWOPI (2.0*M_PI)
#endif

#endif
